Thermoelectric conversion element and thermoelectric conversion module

Active Publication Date: 2015-12-10
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]According to the invention, a thermoelectric conversion element which has a high Seebeck coefficient, a low thermal conductivity, and a high performance, even if a materi

Problems solved by technology

In reality, the amount of the heat energy discharged from trash burning sites, subways, or substations which closely exist is enormous.
The total amount of the energy of the waste heat is great, but the effective energy recollection technology has not been established.
In addition, if a voltage is applied to the both ends of the thermoelectric conversion element, a temperature difference is generated.
The Seebeck effect of this thermoelectric conversion was disco

Method used

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  • Thermoelectric conversion element and thermoelectric conversion module
  • Thermoelectric conversion element and thermoelectric conversion module
  • Thermoelectric conversion element and thermoelectric conversion module

Examples

Experimental program
Comparison scheme
Effect test

Example

[0053]Example 1 of preferred shapes of artificial lattice: Lieb-type lattice

[0054]FIG. 3 is an example of the Lieb-type lattice, FIGS. 3(a) and 3(a)′ are diagrams of unit cells, FIG. 3(b) is a diagram illustrating the unit cell illustrated in FIG. 3(a) periodically arranged in the two-dimensional direction, and FIG. 3(c) is a diagram illustrating the unit cell illustrated in FIG. 3(a)′ periodically arranged in the one-dimensional direction. The Lieb-type lattice is a lattice formed of two auxiliary lattices of A and B as illustrated in FIG. 3(a), and has a structure in which edges are formed between A and B. In addition, there is a characteristic in that the numbers of lattice points of A and B are different. FIG. 3 illustrates an example in which the ratio between the lattice points (A:B) becomes 2:1. In FIG. 3(a), vertexes B in the 4 corners respectively count by ¼ so that a total thereof becomes 1 point, and four edges A respectively count by ½ so that a total thereof becomes 2 p...

Example

[0059]Example 2 of preferred shapes of artificial lattice: Tasaki-type lattice

[0060]The Tasaki-type lattice has a characteristic in that a cell as a unit is a complete graph. The Tasaki lattice is a lattice in which a method of selecting basic cells is important, and even if the localization unique state that occurs in cells as a unit connects cells, the localization unique state is continued without changing the formation, so that a flat band is created. The triangle lattice illustrated in FIG. 2 is an example of the complete graph, and all lattice points are connected by edges. If the value of the integral of the movement is set to be 1, and an on-site energy is set to be 1, the Hamiltonian of the triangle unit cell as illustrated in FIG. 4(a)

[0061][Expression 4]

H=⌊111111111⌋(4)

[0062]is expressed as Expression (4) above. The unique value has a zero unique value subjected to the two-fold degeneration. In the Tasaki-type lattice, the localization unique state is maintained by connec...

Example

[0071]Example 3 of preferred shapes of artificial lattice: Mielke-type lattice

[0072]A Mielke-type lattice is a plane graph, and has a characteristic in which a structure of a line graph LG when the lattice in two AB auxiliary lattices of a lattice called A and a lattice called B is the graph G is a lattice. Hereinafter, a method of creating a line graph is described in detail with reference to FIG. 7. A graph Gh having a formation of a hexagonal lattice is illustrated in FIG. 7(a). The hexagonal lattice can be viewed as a structure in which lattices in the same kind form an auxiliary lattice. New vertexes are positioned on median points of respective edges in the hexagonal lattice-based graph Gh. If the vertexes are disposed in that manner, the disposition becomes as illustrated in FIG. 7(b) (first step). If edges in Gh on which newly disposed different vertexes are mounted are connected by one vertex of Gh, the two edges are connected by a new edge so that the disposition becomes a...

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Abstract

In order to provide a thermoelectric conversion element which has a high Seebeck coefficient, a low thermal conductivity, and a high performance, even if the material system that has a low environmental load and can reduce the cost is used, the thermoelectric conversion element in which lattice points are classified into two or more kinds (A site and B site), lattices of which the kinds are different are connected to each other, the numbers of lattices of which the kinds are different are different (A site: 2, and B site: 1), and a lattice structure is configured by arranging nanoparticles or semiconductor quantum dots, includes areas of which conductivity types are different.

Description

TECHNICAL FIELD[0001]The invention relates to a thermoelectric conversion element and a thermoelectric conversion module in which materials having nanosize lattices or fine particles are used, by using artificial organization or self-organization.BACKGROUND ART[0002]Currently, due to circumstances of environment, energy problems, and the depletion of resources, an active use of natural energies such as solar energy, wind power, and geothermal heat which are not accompanied by the generation of greenhouse gases without depending on fossil fuels is desired. While solar power generation, wind power generation, and the like in which environmental load is low are spread, effective use of heat energy has been attracting attention. In reality, the amount of the heat energy discharged from trash burning sites, subways, or substations which closely exist is enormous. The temperature of the waste heat discharged from trash burning sites or the like is as high as 300° C. to 600° C., and the te...

Claims

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Application Information

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IPC IPC(8): H01L35/26H01L35/32
CPCH01L35/32H01L35/26H10N10/857H10N10/00H10N10/13H10N10/01H10N10/17
Inventor YABUUCHI, SHINHAYAKAWA, JUNKUROSAKI, YOSUKENISHIDE, AKINORISUWA, YUJI
Owner HITACHI LTD
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